CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuan Wang,Zhikai Liang,Kezhou Jiang,Yifang Lin,Daomiao He,Jinhui Liu,Weixian Wang,Jingfei Wang,Bin Deng,Dan Zhang,Ruijin Yu
A novel single-phase trivalent europium activated red-emitting SrLaNaTeO 6 phosphor was first synthesized in a process of traditional high-temperature solid-state. The phase purity, morphology, and spectroscopy of the prepared phosphor were analyzed. Under 395 nm excitation, the photoluminescence (PL) spectra of the SrLaNaTeO 6 :Eu 3+ products mainly contained five dominant sharp peaks. The intense red emission peak at 615 nm was the typical 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The optimum product of high quenching concentration was the SrLaNaTeO 6 :0.90Eu 3+ , which reached a high internal quantum efficiency (IQE) of 90.6%. The SrLaNaTeO 6 :0.90Eu 3+ was estimated to have R c of 6.57 Å and possessed high color purity of 100.0%. The phosphors exhibited excellent thermal stability and high activation energy ( E a = 0.29 eV). The prepared white light-emitting diode (WLED) had a high color rendering index (CRI) R a of 92 and a low correlated color temperature (CCT) of 5008 K. In conclusion, the phosphors have potential as red components for WLEDs.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xiaojian Zhang,Zhiqin Zhang,Yamin Feng,Honglei Yuan,Gaoliang Wang
Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors were synthesized by sintering at 910 °C for 24 h under air in a muffle furnace. The phase, luminescence properties and potential applications in LED devices were investigated. X-ray diffraction results indicate the successful doping of Bi 3+ ions in Ba 3 Lu 2 B 6 O 15 host. The diffuse reflectance and excitation spectra demonstrate the excitability on UV light. Upon the excitation at 365 nm, the Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors show narrowband blue emission with the peak at 417 nm. The highest emission intensity with the quantum yield of 85.7% and ΔE a value of 0.215 eV is generated by the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor. The light characteristics of the UV-pumped LED devices containing the Ba 3 Lu 1.90 Bi 0.10 B 6 O 15 phosphor demonstrate the potential application of Bi 3+ activated Ba 3 Lu 2 B 6 O 15 phosphors in the lighting field.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 37
·12658-12666
·
IF 6.4
Qiao Qu,Konglan Chen,Yayun Zhou,Jinsheng Li,Haipeng Ji
A K2SiF6:Mn4+ phosphor with narrow line-type red emission plays an important role in white light-emitting diode (WLED) backlights for liquid crystal displays, but this phosphor exhibits weak zero phonon line (ZPL) emission. The ZPL intensity of the Mn4+ 2Eg → 4A2g transition can be enhanced after relaxing the orbital selection rule. We dope Mn4+ into a host lattice with mixed-anions to introduce a distortion of local coordination octahedra around Mn4+ and relax the orbital selection rule. Remarkably, the Na2MoO2F4:Mn4+ phosphor with [MoO2F4] mixed-anion coordination exhibits a dominant luminescence peak at 625 nm (ascribed to the ZPL) and the ZPL to Stokes v6 intensity ratio reaches an unprecedented high value of 243% under 480 nm excitation. Density functional theory calculations indicate that the most energy-efficient pathway for maintaining charge balance during Mn4+-doping involves the substitution of [MoO2F4]2− by [MnF6]2−, which generates a strong crystal field with a high Dq/B value of 4.05 for Mn4+ in Na2MoO2F4. An optimal composition Na2MoO2F4:1.5%Mn4+ (nominal) exhibits a high color purity of 99.3% and a short luminescence lifetime of 0.62 ms, suggesting its potential in fast-response backlight display applications. When incorporated into WLEDs, the red-emitting Na2MoO2F4:Mn4+ phosphor contributes to a broad color gamut (∼108.3% NTSC). Comparative analysis of a series of Mo6+-based oxyfluoride phosphors demonstrates that Mn4+ more readily exhibits intense ZPL and fast luminescence decay occurs when Mo6+ is coordinated in an O/F ordered octahedron.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hongxing Xie,Qizhong Lin,Xinyuan Chen,Sijin Liu,Xingke Zheng,Aochen Du,Zhenyu Zeng,Tianyong Guan,Yun Ye,Enguo Chen,Sheng Xu,Yang Li,Tailiang Guo
Quantum dots (QDs) have showed great potential for next-generation lighting and display technologies. However, its stability is still one of the key problems that limit its practical application. In this paper, by comparing the specific surface area (SSA) and pore width of aluminum oxide (AlO x ) and silicon oxide (SiO 2 ) barrier layers, the relationship between the porosity of barrier layers and the stability of QDs was studied. The results showed that the synthesized SiO 2 -QD-AlO x , which has the smallest SSA in the synthesized QD composites, exhibited the best stability on the quantum dot diffuser plate (QD-DP). Moreover, the operational lifetime (T 80 ) at 450 nm blue light excitation was increased by a factor of 3.41 compared to that of bare QDs. Meanwhile, the prepared QD-DP containing dense SiO 2 -QD-AlO x composites significantly improved the resistance to light, heat, moisture and oxygen. Finally, the prepared QD-DP was assembled into a Mini-LED TV with a wide color gamut and excellent display performance (a color gamut of 157.4 % for commercial normal TV, and 107.19 % for the National Television System Committee (NTSC 1931)). This technique provides favorable guide for effectively enhancing the stability of QDs in lighting and display technologies.
研究领域:
材料科学
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显示技术
·
光学工程
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiaozhong Wu,Decai Huang,Qiuming Lin,Lei Han,Weixiong You,Jing Zhu,Xinyu Ye
The research on near-infrared (NIR) phosphors has become a trending topic, as their optical properties directly impact the performance of the NIR phosphor-converted light-emitting diode (pc-LED). NIR pc-LED has emerged as a multifunctional light source across various fields due to its unique advantages of high penetration and invisibility. Herein, a peculiar broadband NIR-emitting phosphor is presented, RbAl3P6O20: Cr3+ (RAPO: Cr3+), with an NIR emission range from 650 to 1000 nm and peaking at ∼785 nm with a full-width at half-maximum (fwhm) of ∼1900 cm–1. Gaussian fitting analysis reveals that broadband emission originates from Cr3+, occupying two different octahedral sites in the host. The optimized phosphor RAPO: 0.08Cr3+ exhibits an internal quantum efficiency of 60% and excellent thermal stability (90% at 423 K). The application of pc-LED devices was evaluated by assembling a RAPO: 0.08Cr3+ phosphor with an InGaN-based LED (450 nm), achieving a remarkable NIR output power of 27.9 mW at 120 mA. The results demonstrate that RAPO: Cr3+ is an optimistic phosphor for NIR photoelectron (pc-LED) light sources.
研究领域:
材料科学
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光电子学
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固态照明
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光谱学
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光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hangzhang Kou,Fanlei Qin,Jianfeng Wang,Esmaeil Heydari,Gongxun Bai
Near-infrared (NIR) wireless communication has been widely investigated because of its fast transmission speed and good penetration barrier performance. Despite their promising characteristics, the implementation of these materials is substantially limited by thermal degradation effects. To address this challenge, we developed Cr3+-activated gadolinium gallate phosphors that exhibit an emission bandwidth of 92.8 nm at half-maximum intensity while maintaining 86.3% of the initial luminous intensity at 150 °C. Furthermore, phosphor-converted light-emitting diodes (pc-LEDs) were manufactured, attaining a 1060 mW NIR output power and 360 mA current. The device was used to test the signal transmission effect using the prepared NIR pc-LEDs as the light source. In the case of input sine wave, inverse sine wave, and triangle wave, the transmission of the waveform was realized, and its penetration performance was tested. The experimental findings demonstrate that the proposed material exhibits promising applications in NIR optical communication systems.
研究领域:
材料科学
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光学通信
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固态照明
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光子学
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半导体器件
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产品关联
DOI
PubMed
高影响因子
Foods
·
2026
·Vol. 15
·期 5
·836
·
IF 6
Dan Wu,Yongyi Deng,Jiabao Xing,Lianghua Wen,Jiawei Ma,Dubin Dong,Fanrong Cao
Background: Red/blue- light-emitting diode (LED)-assisted withering provides a controllable spectral input to steer tea quality, yet metabolite-level evidence linking spectrum composition to quantitative taste phenotypes in white tea remains insufficient. Methods: Fresh leaves were withered under supplemental red/blue LEDs—S0, S1, S2, S3, S4, and S5—and the resulting white teas were evaluated by quantitative descriptive analysis (QDA), untargeted metabolomics, weighted gene co-expression network analysis (WGCNA), and high-performance liquid chromatography (HPLC) quantification of caffeine, gallic acid, and eight catechin monomers. Results: Red/blue-mixed spectrum enhanced the overall sensory quality relative to the incandescent lamp; S3 maximized sweetness and freshness, whereas S4 minimized bitterness and astringency and achieved the highest overall score. Untargeted metabolomics showed the largest deviation for S0 vs. S4. A total of 18 common metabolites were identified between the S0 and light-supplemented withering treatments, dominated by saccharides and related derivatives. WGCNA linked a saccharide-centered module to higher sweetness/freshness/smoothness and a lipid-oxylipin-centered module to stronger bitterness/astringency. HPLC independently confirmed that S4 contained the lowest catechins and caffeine, supporting its reduced bitter/astringent attributes. Conclusions: Overall, the application of mixed red-blue spectra offered a promising approach to enhancing the palatability of white tea by coordinately intensifying saccharide metabolism while simultaneously suppressing key bitter and astringent components. Our study provided a scientific basis for standardizing white tea processing to enhance sensory quality.
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qiang-Qiang Zhu,Shuxing Li,Qiang Yuan,Hong Zhang,Le Wang
Yellow-emitting YAG:Ce transparent ceramic is recognized as an ideal color converter in high-power blue LEDs and LDs , but the absence of scattering centers in its microstructure leads to a low light extraction efficiency and poor light uniformity. Here, taking advantage of the scattering effect and the transparency of YAG:Ce ceramics, Ce-free YAG phase was used as a second component to form a composite with YAG:Ce phosphor. The sintered YAG:Ce-YAG ceramic possessed a high transparency of ∼63 % and a thermal conductivity of 8.9 Wm −1 K −1 . Due to its beneficial thermal properties and high external quantum efficiency of 70.2 %, the YAG:Ce-YAG ceramic could be excited under a high blue-laser flux density of up to 9.60 W/mm 2 and showed a luminous emittance of 1220 lm/mm 2 . Due to light scattering arising from the slightly different refractive indices of the two phases, the designed YAG:Ce-YAG ceramic showed better lighting effects than a single-phase transparent YAG:Ce ceramic.
研究领域:
材料科学
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光电子学
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光子学
·
陶瓷工程
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DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 29
·7253-7261
·
IF 5.256
L. Y. Wang,E. H. Song,Y. Y. Zhou,T. T. Deng,S. Ye,Q. Y. Zhang
Synthesis with low HF concentration or without HF is all along a fundamental challenge in the field of Mn4+-doped fluoride phosphors for warm-white light emitting diodes (WLEDs). We attempted here to synthesize a red emitting phosphor, Rb2ZrF6:Mn4+, through a two-step co-precipitation method by using H2O as a solvent instead of the highly toxic HF at room temperature. The structure, morphology and the formation mechanism as well as the effect of dopant concentration on the photoluminescence properties have been investigated systematically. The obtained Rb2ZrF6:Mn4+ phosphor shows intense blue absorption and presents satisfactory red emission with high color purity. The exploration of temperature-dependent luminescence reveals that the resultant sample exhibits preferable anti-thermal quenching behavior (∼103.3% of emission intensity at 120 °C relative to 20 °C) along with excellent color stability in the temperature range of 20–160 °C. Thereafter, the reliability examination in a HTHH (85 °C and 85% high humidity) environment indicates that Rb2ZrF6:Mn4+ exhibits favorable longevity. The device featuring the Rb2ZrF6:Mn4+ red phosphor displays good performance (CCT = 3569 K, Ra = 85.5, LE = 139.1 lm W−1), showing the great potential of the as-synthesized Rb2ZrF6:Mn4+ for indoor lighting applications.
研究领域:
材料科学
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光学材料
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固态照明
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无机化学
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光子学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·1798-1808
·
IF 3.094
Nan Zhou,Longhai Liu,Zhipeng Zhou,Ye Zhang,Minghui Li,Cheng Zhou,Mao Xia,Zhi Zhou
In the recent years, Mn 4+ -doped phosphors for indoor plant cultivation have received extensive concern owing to the far-red emission that can match well with the absorption spectra of plant pigments. Whereas, many Mn 4+ -doped phosphors still face some challenges such as poor light efficiency and low thermal stability. It is an effective way to resolve these problems via cation vacancies engineering. Herein, the Ca 14− x Al 10 Zn 6− y O 35 : Mn 4+ phosphors are successfully synthesized by combustion method. The luminescence intensity of Ca 14− x Al 10 Zn 6− y O 35 : Mn 4+ phosphor is enhanced through engineering Ca 2+ and Zn 2+ vacancies according to the charge compensation mechanism. The optimal content of each Ca 2+ and Zn 2+ vacancy is equal to be 0.3. Furthermore, the defect formation is accompanied with lattice distortion, which plays a vital role in driving the excited phonon traps to reduce the energy loss by non-radiation transitions. Therefore, the thermal stability of Ca 14− x Al 10 Zn 6− y O 35 : Mn 4+ phosphor is also improved via engineering cation vacancies. In addition, the Ca 14− x Al 10 Zn 6− y O 35 : Mn 4+ phosphors can be effectively excited by blue light and it exhibits far-red emission due to the Mn 4+ spin-forbidden 2 E → 4 A 2 transition. The results suggest that the Ca 14− x Al 10 Zn 6− y O 35 : Mn 4+ phosphors can have a tremendous potential in indoor plant cultivation.
研究领域:
材料科学
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光学材料
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园艺照明
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固态化学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
J. Narmai,Yu Zhang,Fengxiang Wang,Xuelian Zhou,Kai Li,Ze Wang,Sur Lig,Hala Muji,Qixu Tian,Qier Sa,Kefu Chao
The advancement of backlighting displays is dependent on the development of efficient narrow-band red phosphors. However, challenges such as low thermal stability and insufficient quantum efficiency restrict their widespread use in high-power LEDs. This study reports the synthesis of various solid solutions of Sr 1-x Ca x LiAl 3 N 4 :Eu 2+ (0 ≤ x ≤ 0.8) (SCLAN:Eu 2+ ) through the partial substitution of strontium with calcium using a low gas pressure sintering method (0.3 MPa). The intentional introduction of cation disorder by substituting Sr with Ca significantly enhances quantum efficiency and suppresses thermal quenching. Comprehensive analysis of SCLAN:Eu 2+ phosphors includes their structural characteristics and luminescence properties, as well as the synthesis and thermal quenching of white-light-emitting diodes (w-LEDs). The substitution of Sr with Ca results in a red shift of the emission peak from 654 nm to 687 nm, with the Ca 2+ substituted sample achieving an internal quantum efficiency (IQE) of 83.2%, surpassing that of SrLiAl 3 N 4 :0.02Eu 2+ (SLAN:0.02Eu 2+ ). Temperature-dependent photoluminescence (PL) spectra demonstrate the remarkable thermal stability of the phosphor, maintaining 109.91% of its original intensity at 425 K, which is critical for the applications of high-power LEDs. Furthermore, the development of a warm w-LEDs device yields a correlated color temperature (CCT) of 4044 K and a luminous efficacy of 99.2 lm/w, with a color rendering index (CRI) of 83.5, utilizing commercial YAG:Ce 3+ yellow phosphor in conjunction with SCLAN:Eu 2+ . The performance characteristics of SCLAN:Eu 2+ phosphors indicate significant potential as red color converters for high-power LEDs and backlighting displays.
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DOI
PubMed
高影响因子
Inorganics
·
2026
·Vol. 14
·期 9
·235
·
IF 3.4
Zhengrong Xia,Rongqing Li,Fangfang Liu,Yue Tong,Wang Zhao,Mingjun Song,Weiwei Zhou
Near-ultraviolet-excitable red phosphors with high thermal stability are desirable for phosphor-converted LED applications, including potential plant-lighting applications. Herein, Sm3+- and Eu3+-activated Na3YB8O15phosphors were synthesized by a high-temperature solid-state reaction. Among the investigated compositions, the optimal activator contents were identified asx= 0.02 for Na3YB8O15:xSm3+andy= 0.70 for Na3YB8O15:yEu3+, with concentration quenching in both series mainly governed by dipole–dipole interactions. In the Sm3+/Eu3+co-doped phosphors, the emission color shifted from orange-red toward red as the Eu3+content increased. At 433 K, the Sm3+-doped, Eu3+-doped, and Sm3+/Eu3+co-doped samples retained 119.7%, 93.4%, and 102.3% of their room-temperature integrated emission intensities, respectively. The high thermal stability may be attributed to the structural characteristics of the host, its wide optical band gap, and the temperature-dependent redistribution of Stark and phonon-assisted emission components. A phosphor-converted LED fabricated using Na3YB8O15:0.02Sm3+,0.01Eu3+and a commercial 400–405 nm, 5 W near-UV LED chip produced multiband emission that partially overlapped with the absorption bands of both chlorophylls and the PRand PFRforms of phytochrome. These results suggest that Sm3+/Eu3+-activated Na3YB8O15is a promising thermally robust, spectrum-adjustable red phosphor for LED applications.
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DOI
高影响因子
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